Requires the outlay cap for FY2018 and subsequent fiscal years to be 18% of the gross domestic product (GDP) for that fiscal year as estimated by the Office of Management and Budget (OMB). Prohibits outlays from being less than those for the preceding fiscal year for any fiscal year beginning with FY2019.

Requires OMB to enforce the spending caps using a sequestration to eliminate any excess spending through automatic cuts. Eliminates most exemptions from sequestration.

Permits the budget committees to report a resolution directing the committees of their respective chambers to change existing law to achieve the spending reductions necessary to meet the outlay limits if a sequestration is projected.

Amends the Congressional Budget Act of 1974 to create procedures for the House and Senate to enforce the outlay caps established in this Act.